8.4.1 Approximately 91% of all adults in South Korea have a cell phone. In a simple random sample of 200 adults in the United States, 171 owned cell phones. Is there convincing evidence to suggest the proportion of adults who own cell phones in the U.S. is lower than the proportion of adults who own cell phones in South Korea? Conduct a significance test using the 4-step process.

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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8.4.1 Approximately 91% of all adults in South Korea have a cell phone. In a simple random sample of 200
adults in the United States, 171 owned cell phones. Is there convincing evidence to suggest the proportion of
adults who own cell phones in the U.S. is lower than the proportion of adults who own cell phones in South
Korea?
Conduct a significance test using the 4-step process.
Transcribed Image Text:8.4.1 Approximately 91% of all adults in South Korea have a cell phone. In a simple random sample of 200 adults in the United States, 171 owned cell phones. Is there convincing evidence to suggest the proportion of adults who own cell phones in the U.S. is lower than the proportion of adults who own cell phones in South Korea? Conduct a significance test using the 4-step process.
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